X-ray dental film package



A. F. SULZER AND-H. G. DEWEY.

X-RAY DENTAL FILM PACKAGE. APPLICATION FILED AUG. 16. 1920.

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Jlfie Haywood 5, 5% u Mm & F.0WIJ%M M mm m n w'maesss:

Patented Dec. 5, i922.

siren STA res *PATENT F IFC A ALBERT r. suLznReNn-JnhYwoon GUION' DEWEY; or noonns'rna; NEW Yong,

assrenon s 'ro nAsTivrAn-KonAKcoMPANY, on ROCHESTER, NEW YORK, A

CORPORATION OF NEW YOBKL X-JEtATY DENTAL FILM PACKAGE.

Application filed August 16, 1920. SeriaI .No. 403.867."

T0 aZZ w lt-omit may concern J Be it known that ,we, ALBERT R1 SULZER and HAYWOOD Guroiv Dnwny, citizens of the United States of America, residing at Rochester in the countyof Monroe and State of New Yorlnhave invented certain new and useful Improvements in X-Ray Dental Film Packages, of which the. following'isa :full, clear, and exact specifications Uur invention. relates to-packages of sensitized film prepared for use individually in dental X-ray work. i v v i It is a common practice to cut off with shears the end of packages ofthiskind after they are exposed, in order'to remove the, film for development. As, this is done in a dark room thepackage is frequently not carefully handled butis cut so far-backthat the film is severed within 'theflexposurearea.

It is the. object'o f our inventionto' provide a package which=ma'y.,.be thus opened without injury to theffilm unless the user is grossly careless. This object is attained by placing the vfilm so thatlalong certain edges it will fit closely within the'packagelpermit- .tingthese edgesof the envelopeto be pressed closely against the .rootsof the teeth for obtaining impressions of. the farthest avail able points while along other edgesthe film, is

shorter than -the; envelope having a space along which the wrapping may be severed without injury to the exposure area. The film and the interior of the envelope are so shaped as to coact to hold the film properly centered in the package so that it will not slip from its proper position, but, however used, will remain with the free cutting space at the end.

Reference will now be made to the appended drawings in which the same reference characters refer to the same parts throughout.

Fig. 1 is a plan of one form of our invention the envelope being partially removed.

Fig. 2 is a longitudinal section'of the form of ackage shown in Fig. 1.

*igs. 3 and 4 are sections of other embodiments of our invention.

The embodiment shownin Figs. 1 and 2 comprises two sheets of sensitized material 1, lying between two sheets of opaque paper 2. A cover sheet 3 has its edge 4 folded around the edges of the films and. protective papers, and a sealing sheet 5 with an adhesive under-surface is secured thereto.

This package, as thus far described, is the invention of Frank W. Lovejoy and is described in hisapplication, Serial No. 381.728, filed May 15, 1920. i

The film shown in Fig. 1. has at each end two ears dextending longitudinally therefrom 1 beyond the exposure area.\ the usual extent of which is indicated by dotted lines Forthe samesize exposure area, it is necessary of course to use a longer envelope than usual. The ears do not need to have sensitized emulsionthereon. but as the simplest way of making them is to stamp the in dividual sheets from large sheetsoffsensitized: film,- they usually will be {so coated.

They are not,' however, to be. considered as part of the normal {exposure area.

. Another and preferredform of ourlinvention is shown in Fig. 3 In this, the film 10 is shorter than the envelope 11 but the length of, its straight sides is the same. The envelope and film, are made with rounded corners, those 12 of the film being madewith a considerably shorter radius of-curvaturethanthose 13of the envelope.

It follows that the film is thus heldcentrally located in the envelope since it can not move up past the pointwhereihe curvature of the envelope begins ateither' end. The curvature of the envelope acts as an abutment to locate and hold in position the film. If desired the space may be left at one end only as indicated at 14, Fig. 4, and the corner of the film may be square as at 15, but we prefer the form shown in Fig. 3; since this form of film is the same as that nowused in closely fitting envelopes and the one for which present developing and filing apparatus is designed. It is moreover economically manufactured and convenient in use. It is preferable moreover to have the space at each end since the user does not have to take pains to cut at the one end which would have to be suitably marked.

It is a necessary and essential part of our invention that the envelope and film be structurally adapted to coact so that the film will be positively and firmly held in the desired exposure position. since if it were free to move, the userwould not be sure of the exact position of the exposure area, and we the same'lengthas said interior side walls,

the film having an exposure area appreciably shorter than the internal length of the envelope, and at least one interior end wall of the envelope and the corresponding end of the contained film being so shaped that the said interior end wall of the envelope constitutes an internal abutment holding the film in such position that there is left a space along that end where the envelope may be severed without injury to the exposure area of the film.

2. An X-ray dental film package comprising an envelope and a film contained therein, said envelope at one end having its corners rounded internally and said film being shorter than the envelope, and having at its corresponding end sharper corners than the envelope, whereby it will be prevented from movement into that end of the envelope.

3. An X-ray dental film package comprising an envelope and a film therein shorter than the envelope, the interor width of the envelope and the width of the film being substantially the same, the envelope having straight interior side walls and the film having straight side edges of the same length as said interior side walls, said envelope having its'corners at least one end rounded internally, and the film having at the corresponding end sharper corners than the envelope, whereby it will be prevented from movement into that end of the envelope.

at. A11 X-ray dental film package comprising an envelope and a film contained therein, said envelope having corners rounded internally, and said film being shorter than the envelope and having sharper corners than the envelope, whereby the film is centrally positioned in the envelope.

5. An X-ray dental film package comprising afiat, opaque, sealed envelope and a fiat, sensitized film contained therein, said envelope having interiorly straight sides and rounded corners, and said film having straight sides and corners rounded with a shorter radius of curvature than the envelope corners, the film being shorter than the envelope. and the film being thus centrally located in the envelope, so that there is left at each end a space within the envelope beyond the film, across which space the envelope may be severed without injury to the film.

6. AnX-ray dental film package comprising an envelope and a film therein, the interior width of the envelope and the width of the film being substantially the same, the envelope having straight interior side walls, and the film having straight sideedges of the same length as said interior side walls, the film being shorter than the interiorof the envelope and having sharply rounded corners and the interior corners of the envelope being rounded with a greater radlus of curvature, whereby there is left at each end a space within the envelope beyond the film, across which space the envelope may be severed withoutinjury to the film.

Signed at Rochester, New York, this 10th day of August, 1920. ALBERT F. SULZER. HAYWOOD GUION DEWEY, 

